Carrier or sheave-truck for hoisting machinery



(No Model.)

C. W. HUNT.

CARRIER OR SHEAVE TRUCK FOR HOISTING MACHINERY.

Patented Aug. '7', 1883.

PETERS, mlwmhognphu. Washillgilm. DJ;

NITED STATES PATENT FFIcE.

CARRIER OR SHEAVE-TRUCK FOR HOISTING MACHINERY.

SPECIFIOATION forming part of Letters Patent No. 282,640, dated August'7, 1883, Application filed June 9, 1883. (No model.)

To all whom it may concern:

Be it known that 1, CHARLES W. HUNT, of West New Brighton, in the countyof Richmond and State of New York, have invented a new and usefulImprovement in Carriers or sheave-Trucks for Hoisting Machinery; and thefollowing is declared to be a full, clear, and exact description of thesame.

In the hoisting of coal from barges to cars, or in lowering andtransferring coal from cars to vessels for consumption ortransportation, as well as in transferring other commodities by means ofhoisting machinery, the rope employed is very liable to become twistedabove the pulley-block, because of the proximity of the upper ends, andso cause inconvenience, trouble, and delay.

The object of my invention is to prevent the aforesaid twisting and toprovide a spreading device operating automatically by the weight of thematerial being handled, so that the higher ends of the rope will bespread when the weight is down and proportionately drawn together as theweight ascends.

My invention consists in the combination, with a carrier or sheave-truckand the hoisting-rope, of a self-acting spreader, to which the end ofthe hoisting-rope is connected, the same serving to spread the twohanging portions of the rope at the upper end a sufficient distance toprevent said parts of the rope twisting together.

In the drawings, Figure 1 is a side elevation of a coal or ore hoistemployed by me and upon which my automatic spreader is applied. Fig. 2is a side elevation of my improved sheave-truck and spreader and itsways in larger size, and Fig. 3 is a side elevation of a modification ofmy sheave-truck and spreader.

The coal or ore hoist is to be placed in any desired locality, and itmay be provided with the track A for cars, and the inclined trackB issupported by a frame-work of timbers, 0.

My improved sheave-truck D is adapted to travel on the track B. Thecarrier or sheave-truck D consists of a frame or castings securedtogether and mounted upon four flanged wheels which travel upon the waysor inclined tracks B. In connection with this sheave-truck a sheave, a,is mounted, over which the hoisting-rope b travels in raising andlowering the pulley-block E and bucket F.

The hoisting-rope passes overa pulley, G, at

- frame of the pulley-block stops against the eye,

and then the rope draws the truck up the incline to the place ofdelivery. The reverse movement takes place when the truck is allowed torun down, and when the truck arrives at the block H its motion isarrested, and the bucket is lowered vertically as the hoisting rope isslackened. This mode of operation is the same as has heretofore beenemployed; but it has been usual to attach the end of the hoisting-ropedirectly to the truck, and hence there is liability for the verticalportions of the rope to twist together. I prevent this by the use of aself-acting spreader which intervenes between the end of thehoisting-rope and the truck, so that the said spreaderwidens thedistance between the end of the'rope and the pulley over which the otherportion of such rope passes. The device which I prefer consists of thejointed links shownin Fig. 2, which are so placed that the point ofattachment of the rope moves in a straight line. The links 1 and 2 arepivoted at the bolt 8 and hang from the same. To the lower ends thelinks 6 and 7 are pivoted. These are united at theirlower ends and tothe eye, to which the end of the hoisting-rope is attached. The link 3is pivoted at the upper end by the bolt 9, and its lower end is hingedto the two links 4 and 5, which are hinged at the junction of the links1 and 6 and 2 and 7, respectively. The link 3, being shorter than thelinks 1 and -2, de scribes an arc of a circle of less radius, and in sodoing spreads or draws together the links 4 5 6 7, and the attaching-eyeH, instead of swinging in the arc of a circle, moves along the inclinedline as w,- hence as the pull of the rope b draws the hoisting-pulley uptoward the truck the spreader-links will swing at their lower end towardthe hoisting-sheave a,- but as the bucket is lowered the links willmove,,so that the upper end of the hoisting-rope is carried off to theposition V, or nearly so. This keeps the nearly vertical parts of therope so far from each other that there is no risk of their twistingtogether.

' I provide a projection or stop, a, Fig. 2,

upon the frame of the sheave-truck, to limit the motion of the linksystem whenthe bucket is raised and, with the truck, is being drawn upthe inclined plane or ways B. This automatic spreader may be in the formof a sheave-truck, D, (shown in Fig. 3,) the same resting upon aninclined track, 13, suspended from the sheavetruck. The track B being atan inclination" causes the truck D to run away from the descending ropeas the bucket is lowered, and in so doing the end of the rope is carriedoff sufficiently to prevent the two parts of said rope from twistingtogether. I 1

It is obvious that a spring might be substituted for the before-nameddevices by attaching one end of the same to the frame of theinventionbeing a device for shifting the position of the eye or loop at the fastend of the rope, spreading the upper end of the rope, and

thus obviating the difficulty arising from the twisting of the rope.

I claim as my invcntion 1. In combination with a carrier or sheavetruckfor hoisting machinery, an automatic spreader to which the end of thehoisting-rope is attached, whereby the parts of the rope are spread asthe bucket is lowered, as set forth.

2. The combination, in a hoisting-machine, of the inclined ways,hoisting-rope, bucket, and sheave-truck, and composed of a system oflinks connectedto the frame of the sheave-truck and to the end of thehoisting-rope, respectively, and operating substantially in the mannerand for the purposes set forth.

3. In a hoisting-machine, the combination,

with the inclined track 13, supporting-timbers O, sheave-truck D, ropeI), and a pulley-block upon said rope, of the links 1 2 4 5 6 7, bolt 8,the eye or loop H, and projection or stop a, substantially as and forthe purposes set forth.

Signed by me this 1st day of June, A. D. 1883.

CHAS. W. HUNT.

\Vitnesses:

HOLDRIDGE O. OoLLINs, D. BUTTER.

an automatic spreader

